Spectroscopic characterization and simulation of chemical sputtering using the DiMES porous plug injector in DIII-D

A. G. McLean; J. W. Davis; P. C. Stangeby; N. H. Brooks; D. G. Whyte; S. L. Allen; B. D. Bray; S. Brezinsek; J. D. Elder; M. E. Fenstermacher; M. Groth; A. A. Haasz; E. M. Hollmann; R. C. Isler; C. J. Lasnier; D. L. Rudakov; J. G. Watkins; W. P. West; C. P C Wong

doi:10.1016/j.jnucmat.2006.12.062

Spectroscopic characterization and simulation of chemical sputtering using the DiMES porous plug injector in DIII-D

A. G. McLean^*, J. W. Davis, P. C. Stangeby, N. H. Brooks, D. G. Whyte, S. L. Allen, B. D. Bray, S. Brezinsek, J. D. Elder, M. E. Fenstermacher, M. Groth, A. A. Haasz, E. M. Hollmann, R. C. Isler, C. J. Lasnier, D. L. Rudakov, J. G. Watkins, W. P. West, C. P C Wong

^*Corresponding author for this work

Not published at Aalto University

Research output: Contribution to journal › Article › Scientific › peer-review

17 Citations (Scopus)

Abstract

A self-contained gas injection system for the Divertor Material Evaluation System (DiMES) on DIII-D has been employed for in situ study of chemical erosion in the tokamak divertor environment. The porous plug injector (PPI) releases methane into the plasma at a controlled rate through a porous graphite surface flush to a tile. In this way, the perturbation to the local plasma can be minimized, while also simulating the immediate environment of methane molecules released from a solid graphite surface. Photon efficiencies of CH₄ for measured local plasma conditions are reported. The contribution of chemical vs physical sputtering to the source of C⁺ at the target can, in principle, be assessed through measurement of CII and CD/CH band emissions during release of CH₄ from the PPI, and due to intrinsic emission. These first results from this new experimental tool demonstrate the potential for the PPI to provide definitive results in future applications in DIII-D and indicate the improvements required to obtain firm quantitative conclusions.

Original language	English
Pages (from-to)	86-90
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	363-365
DOIs	https://doi.org/10.1016/j.jnucmat.2006.12.062
Publication status	Published - 15 Jun 2007
MoE publication type	A1 Journal article-refereed

Keywords

C0100
Carbon impurities
DIII-D
F0800
Hydrocarbons
P0500
S1300
T0100

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10.1016/j.jnucmat.2006.12.062

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McLean, A. G., Davis, J. W., Stangeby, P. C., Brooks, N. H., Whyte, D. G., Allen, S. L., Bray, B. D., Brezinsek, S., Elder, J. D., Fenstermacher, M. E., Groth, M., Haasz, A. A., Hollmann, E. M., Isler, R. C., Lasnier, C. J., Rudakov, D. L., Watkins, J. G., West, W. P., & Wong, C. P. C. (2007). Spectroscopic characterization and simulation of chemical sputtering using the DiMES porous plug injector in DIII-D. Journal of Nuclear Materials, 363-365, 86-90. https://doi.org/10.1016/j.jnucmat.2006.12.062

@article{36d98ca99be944ffb8d8c93761525191,

title = "Spectroscopic characterization and simulation of chemical sputtering using the DiMES porous plug injector in DIII-D",

abstract = "A self-contained gas injection system for the Divertor Material Evaluation System (DiMES) on DIII-D has been employed for in situ study of chemical erosion in the tokamak divertor environment. The porous plug injector (PPI) releases methane into the plasma at a controlled rate through a porous graphite surface flush to a tile. In this way, the perturbation to the local plasma can be minimized, while also simulating the immediate environment of methane molecules released from a solid graphite surface. Photon efficiencies of CH4 for measured local plasma conditions are reported. The contribution of chemical vs physical sputtering to the source of C+ at the target can, in principle, be assessed through measurement of CII and CD/CH band emissions during release of CH4 from the PPI, and due to intrinsic emission. These first results from this new experimental tool demonstrate the potential for the PPI to provide definitive results in future applications in DIII-D and indicate the improvements required to obtain firm quantitative conclusions.",

keywords = "C0100, Carbon impurities, DIII-D, F0800, Hydrocarbons, P0500, S1300, T0100",

author = "McLean, {A. G.} and Davis, {J. W.} and Stangeby, {P. C.} and Brooks, {N. H.} and Whyte, {D. G.} and Allen, {S. L.} and Bray, {B. D.} and S. Brezinsek and Elder, {J. D.} and Fenstermacher, {M. E.} and M. Groth and Haasz, {A. A.} and Hollmann, {E. M.} and Isler, {R. C.} and Lasnier, {C. J.} and Rudakov, {D. L.} and Watkins, {J. G.} and West, {W. P.} and Wong, {C. P C}",

year = "2007",

month = jun,

day = "15",

doi = "10.1016/j.jnucmat.2006.12.062",

language = "English",

volume = "363-365",

pages = "86--90",

journal = "Journal of Nuclear Materials",

issn = "0022-3115",

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McLean, AG, Davis, JW, Stangeby, PC, Brooks, NH, Whyte, DG, Allen, SL, Bray, BD, Brezinsek, S, Elder, JD, Fenstermacher, ME, Groth, M, Haasz, AA, Hollmann, EM, Isler, RC, Lasnier, CJ, Rudakov, DL, Watkins, JG, West, WP & Wong, CPC 2007, 'Spectroscopic characterization and simulation of chemical sputtering using the DiMES porous plug injector in DIII-D', Journal of Nuclear Materials, vol. 363-365, pp. 86-90. https://doi.org/10.1016/j.jnucmat.2006.12.062

TY - JOUR

T1 - Spectroscopic characterization and simulation of chemical sputtering using the DiMES porous plug injector in DIII-D

AU - McLean, A. G.

AU - Davis, J. W.

AU - Stangeby, P. C.

AU - Brooks, N. H.

AU - Whyte, D. G.

AU - Allen, S. L.

AU - Bray, B. D.

AU - Brezinsek, S.

AU - Elder, J. D.

AU - Fenstermacher, M. E.

AU - Groth, M.

AU - Haasz, A. A.

AU - Hollmann, E. M.

AU - Isler, R. C.

AU - Lasnier, C. J.

AU - Rudakov, D. L.

AU - Watkins, J. G.

AU - West, W. P.

AU - Wong, C. P C

PY - 2007/6/15

Y1 - 2007/6/15

N2 - A self-contained gas injection system for the Divertor Material Evaluation System (DiMES) on DIII-D has been employed for in situ study of chemical erosion in the tokamak divertor environment. The porous plug injector (PPI) releases methane into the plasma at a controlled rate through a porous graphite surface flush to a tile. In this way, the perturbation to the local plasma can be minimized, while also simulating the immediate environment of methane molecules released from a solid graphite surface. Photon efficiencies of CH4 for measured local plasma conditions are reported. The contribution of chemical vs physical sputtering to the source of C+ at the target can, in principle, be assessed through measurement of CII and CD/CH band emissions during release of CH4 from the PPI, and due to intrinsic emission. These first results from this new experimental tool demonstrate the potential for the PPI to provide definitive results in future applications in DIII-D and indicate the improvements required to obtain firm quantitative conclusions.

AB - A self-contained gas injection system for the Divertor Material Evaluation System (DiMES) on DIII-D has been employed for in situ study of chemical erosion in the tokamak divertor environment. The porous plug injector (PPI) releases methane into the plasma at a controlled rate through a porous graphite surface flush to a tile. In this way, the perturbation to the local plasma can be minimized, while also simulating the immediate environment of methane molecules released from a solid graphite surface. Photon efficiencies of CH4 for measured local plasma conditions are reported. The contribution of chemical vs physical sputtering to the source of C+ at the target can, in principle, be assessed through measurement of CII and CD/CH band emissions during release of CH4 from the PPI, and due to intrinsic emission. These first results from this new experimental tool demonstrate the potential for the PPI to provide definitive results in future applications in DIII-D and indicate the improvements required to obtain firm quantitative conclusions.

KW - C0100

KW - Carbon impurities

KW - DIII-D

KW - F0800

KW - Hydrocarbons

KW - P0500

KW - S1300

KW - T0100

UR - http://www.scopus.com/inward/record.url?scp=34248581143&partnerID=8YFLogxK

U2 - 10.1016/j.jnucmat.2006.12.062

DO - 10.1016/j.jnucmat.2006.12.062

M3 - Article

AN - SCOPUS:34248581143

SN - 0022-3115

VL - 363-365

SP - 86

EP - 90

JO - Journal of Nuclear Materials

JF - Journal of Nuclear Materials

ER -

Spectroscopic characterization and simulation of chemical sputtering using the DiMES porous plug injector in DIII-D

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Keywords

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